Dual-Band High-Efficiency Power Amplifier Based on a Series of Inverse Continuous Modes With Second-Harmonic Control

This letter proposes a design approach for a dual-band (DB) power amplifier (PA) based on a series of inverse continuous modes (SICMs). The approach possesses a wider fundamental and second-harmonic impedance space compared with inverse continuous class-F, and the dual bandwidths of the DB PA can be improved flexibly. In addition, a variable knee voltage is considered for predicting the output performance of the PA more accurately. A simple impedance control network only for the second-harmonic is exploited to improve PA efficiency. Simulation and measurement results indicate that the fabricated DB PA achieves drain efficiencies of 65%–80.9% from 2.43 to 2.70 GHz, and 65%–76.2% from 3.37 to 3.52 GHz, respectively, and the obtained output power exceeds 10 W in DBs.